Anas (May Allah be pleased with him) reported:
The Messenger of Allah (ﷺ) said, "He who goes forth in search of knowledge is considered as struggling in the Cause of Allah until he returns."[At- Tirmidhi]. (FR)
App reference (FR): Book 13, Hadith 10 (FR)
Arabic/English book reference (FR): Book 13, Hadith 1385 (FR)